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Accrued Expenses (Tables) | 9 Months Ended
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Sep. 30, 2018
Payables And Accruals [Abstract] |
Summary of Composition of Accrued Expenses | The following table presents the composition of accrued expenses as of September 30, 2018 and December 31, 2017 (in thousands):
|  | September 30, 2018 |  |  | December 31, 2017 |
Compensation and related benefits |  | $ | 3,402 |  |  | $ | 4,465 |
Consulting and professional fees |  |  | 833 |  |  |  | 461 |
Research and development expenses |  |  | 209 |  |  |  | 497 |
Sales and marketing expenses |  |  | 148 |  |  |  | 620 |
Warranty |  |  | 650 |  |  |  | 570 |
Sales tax payable |  |  | 376 |  |  |  | 322 |
Interest payable |  |  | 237 |  |  |  | 188 |
Other |  |  | 528 |  |  |  | 388 |
Accrued expenses |  | $ | 6,383 |  |  | $ | 7,511 |

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